while与when的区别与用法

一。引导时间状语从句时，WHILE连接 的是时间段，而WHEN连接的多是时间 点 例如What does your father do while your mother is cooking? What does your mother do when you co me back? 二，WHILE可以连接两个并列的句子， 而WHEN不可以 例如I was trying my best to finish my wo rk while my sister was whtching TV 三，WHEN是特殊疑问词，对时间进行 提问，WHILE不是。 例如，When were you bron?

选答案时 一般后面出现-ing形式多选while 出现do 则选when